How many different types of TCRs are thought to exist? A. No more than 100 B. On
ID: 98252 • Letter: H
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How many different types of TCRs are thought to exist? A. No more than 100 B. On the order of thousands C. On the order of millions D. At least 10^3 The type of immune response produced by T cells is called: A. Antibody-mediated immunity B. Cell-mediated immunity C. Interleuken-mediated immunity D. Humoral immunity What type of cell has CD8 cell-surface glycoproteins? A. Cytotoxic T cells B. B cells C. Helper T cells D. Macrophages The HIV virus binds specifically to CD4 cell-surface glycoproteins and therefore has what type of host cell? A. B cells B. Cytotoxic T cells C. Helper T cells D. Macrophages Helper T cells are distinguished by secretion of cytokines which includes which of the following? A. Gamma interferon B. Interleukins C. Chemokines D. All of the above 46. What process occurs during development of the immune system that removes lymphocytes that might attack the body's own cells? A. Autoantigen elimination B. Clonal deletion C. ClonalExplanation / Answer
Q 42- answer is B.
immune reponse produced by T cells is called cell mediated immunity .
In our body there is two types of immune response
1. humoral immunity and cell mediated immunity .
Humoral immunity is mediated by macromolecules like antibodies so it is also called as antibody mediated immune system. While cell medited immune response doesnot contains antibody but it contains phagocytes which kill the antigens.
Q 43.answer is A
CD8 cell surface glycoprotein present on surface of cytotoxic T cells . Cytotoxic T cells have TCR(T cell receptor) in form of CD8 glycoproteins which binds with MHC(major histocompatiability complex) to intiate the immune reponse.
Q 44 Answer is C
Helper cells contains TCR CD4 glycoproteins on its surface which binds with MHC II and intiate the immune system .HIV virus directly infect the CD4 cells so reduction of number of CD4 can cause AIDS .
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